Baker&#39;s oven and the like.



G. F. HUMPHREY. BAKERS OVEN AND THE LIKE. APPLIOATION FILED JAN. 2,1913.

. 1 0 0 41 Patented May 6, 1913.

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WITNESSES: [NVENTQR Y G. F. HUMPHREY.

. BAKERS OVEN AND THE LIKE.

APPLICATION FILED JAN. 2, 1913.

1,060,841. Patented May 6,1913.

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COLUMBIA PLANDURAPH 60., WASHINGTON. 'D'. c.

UNITED STATES I ATENT FFC.

GEORGE FREDERICK HUMPHREY, OF LONDON, ENGLAND.

BAKER/S OVEN AND THE LIKE.

Specification of Letters Patent.

PatentedMay 6, 1913.

Application filed January 2, 1913. Serial No. 739,725.

ments in Bakers Ovens and the Like, of

which the following is a specification.

It has heretofore been set forth in patents that flowing steam or othergaseous fluids, hereinafter designated steam, for convenience, may besuperheated without material increase in pressure but with increasedvelocity of motion or by allowing suitable increase in volume, or both,and this broad idea has been utilized in ovens, rapidly moving lowpressure steam being superheated, to increase its velocity, then reducedin velocity in a radiator, of larger cross-sectional area, where itgives up heat, and then discharged.

The present invention involves using a plurality of radiators throughwhich the same heating fluid passes in succession being superheatedafter passing each radiator, to restore the heat which it has lost. Itis found that by properly proportioning the different portions of theconduit no material back pressure is produced by such superheating, andan important saving in fuel results, while by the use of proper adjunctssteadiness of any desired heat and perfection of cont-r01 are attained.

In the accompanying drawings, Figure 1 is a diagrammatic elevation of aplant having double deck ovens with top and bottom heating elements, orradiators, in each oven. Fig. 2 is a diagrammatic plan of the plant ofFig. 1, the radiators, for clearness, being arranged around thesuperheaters. Figs. 3 and 4e are sectional elevations the sections beingin planes perpendicular to each other.

In these figures, (1 represents a boiler or other source of supply forlow pressure steam which passes through a pipe 6, e, a header 5,superheater coils 0 located in a casing b, a header d and pipe f to aheader 9, coils in and header 2" of a radiator, designated as a whole byI. From the header i a pipe e leads to a second superheater similar tothe first and consisting of a header b coils c and header d From thislatter header the steam passes by a pipe f to a second radiator II, likethe first, and then to the header 6 of a third superheater, and so on,four radiators, I, II, III, IV, being shown, although moreor less may beused.

From the last radiator the steam is discharged through a pipe 6 Thesuperheater coils c, 0 etc., are separately heated from a space 5 bygaseous or other heating agent. The delivery pipes from the superheatersare provided with valves 6 permitting steam to be blown ofl while thecorresponding superheater is being brought up to working condition, andby common devices, not shown, any radiator or pair of radiators may becut out when desired; and the temperature of the ovens may be regulated,within somewhat Wide limits, by throttling the steam passing therefrom.

The temperature of the steam in different parts of its path is not thesame yet its pressure varies but little and back pressure is practicallyavoided, a peculiar result essential to the proper operation of theseries arrangement and one not ordinarily thought obtainable. Inpractical use of the apparatus I have secured a great saving of fuelover ordinary oven arrangement and over apalogous devices with theradiators in para lel.

It is evident that since the steam supplied to all the superheatersafter the first is at a higher temperature than when it is delivered tothe first superheater by the boiler, less heat is required for theseheaters than for the first. It has been found that in order to securethe proper velocities and temperatures at all points the proportions ofthe cross-sectional areas may be 1 for the pipe 6, 9 for the headers andcoils Z), d, h, for the coils c, 4 for the pipe f, and 2 for the pipe 6What I claim is:

1. The combination with an oven provided with a plurality of fluidheated radiators arranged in series of independent means forsuperheating the fluid between successive radiators.

2. In oven construction, the combination with two radiators located inthe baking space and adapted to be heated by fluid flowing through them,of two fluid superheaters without said space and having theircross-sectional fluid-passage areas materially less than those of saidradiators, a conduit from the first superheater to the first radiator, aconduit leading from the first radiator to the second superheater, aconduit leading from the second superheater to the second radiator, anda conduit leadsages of less cross-sectional area than the 10 ing fromthe second radiator out of said passages of the radiators.

space. In testimony whereof I have signed my 3. The combination with aplurality of name to this specification in the presence of ovensprovided with internal radiators, of two subscribing witnesses.

conduits connecting all the radiators in sei GEORGE FREDERMJK HUMPHREY.ties with a source of low pressure steam, and Witnesses:

super-heaters interposed in said conduits be- SAMUEL JOHN CLARKE,

tween successive ovens and having fluid pas- EDWARD ALLBRIGHT ROBINSON.

Copies of this patent may be obtained for five cents each, by addressingthe "Gommissioner of Patents, Washington, D. G.

